Duplex inking-gear for platen printing and for die presses.



110,890,455. I BATENTED JUNE 9, 1908.

M. ROGKSTRQH.

DUPLEX INKING GEAR FOR PLATBN PRINTING AND FOR DIE PRESSES.

APPLICATION 21mm SEPT. 11. 1907.

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PA'IBNTED JUNE 9, 1908.

M. ROGKSTROH. I

DUPLEX INKING GEAR FOR PLATEN PRINTING AND FOR. DIE PRESSES. nrmcxnon rmm snr'r..11. i901.

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MAX ROCKSTROH, OF KLEIN-SEDLITZ, NEAR PIRNA, GERMANY.

DUPLEX INKING-GEAR FOR PLATEN PRINTING AND FOR DIE PRESSES.

Specification of Letters Patent.

Patented June 9, 1908.

Application filed September 11, 1907. Serial No. 392,328.

To all whom it may concern:

Be it known that I, MAX ROOKSTROH, director, subject of the Kingdom of Saxony, residing at Klein-Sedlitz, near Pirna, Villa Liitzow, Germany, have invented certain new and useful Improvements in Duplex inking- Gears for Platen Printing and for Die Presses, of which the following is a specification.

The object of this invention is to enhance the distribution of ink in platen printing presses to a degree so far not accomplished.

So-called duplex inking gears are already known in which the inking rollers distribute the ink during the downward motion of the roller carriage and in which these rollers are replenished with ink prior to their upward motion. In such inking gears the one set of rollers, which during its downward motion served for inking the form and which in consequence had lost ink, was replenished with ink while below the form, so that it could serve for inking the form during its return journey together with the two other inking rollers which as yet had not given up their ink during their downward motion. The covering-power secured in this manner was nearly equivalent to that usually obtained from six inking rollers.

According to the present invention the covering secured with one inking is made equivalent with that obtainable from eight inking rollers, i. c. with double the number of inking rollers actually used.

The general arrangement of a duplex inking gear with four inking rollers, for example, is indicated in the accompanying drawing, the gear being re resented above the form in Figure 1, in its ownward passage over the form in Fig. 2, below the form in Fig. 3, and in its upward passage over the form in Fig. 4.

The lnking rollers a, or rather their bearings, are fitted with springs to the roller frame (2 in the known manner, by placin spiral s rings around their hearing spindles The joc rey rollers b are likewise supported in a flexible manner in the roller frame d by placing springs around their bearing spindles Pivots i of the roller frame engage with slots Z for suspending the bar 6 the latter having slanting guide surfaces s,corresp0nding in number with the jockey rollers bat its outer edge, which serves for sup orting the cross-bars h of the jockey r0 lers g. Fixed stops 0 and p are provided below the form n; the ends of the elastically supported inking roller spindles f come in contact with the first mentioned stop 0 when the roller frame travels in a downward direction, while the stop 1) serves for hfting the bar 6 thus causing the studs 9 of the jockey rollers,

or rather their cross-bars 7b to slide down the slanting guide surfaces 8 of bar 6.

The method of operating is as followsz- The inking rollers a are saturated with completely tempered ink from the upper inking apparatus as soon as the roller carriage has arrived in its highest position. Several jockey rollers rest upon each of the inking rollers and these therefore also become saturated with the finely tempered ink. Upon the downward motion of the rollers, which next takes place, the form is inked by all of the inking rollers; the small jockey rollers I), however, retain an ink supply by remaining out of contact with the inking rollers they being supported by the roller frame and in consequence are carried with it past the form. Below the form a portion of the inking rollers comes in contact with the high speed cylinders 0, there located, and owing to a all of the jockey rollers 7) coming into contact with the rollers a a linking of the entire number of the inking rollers is effected.

In the present case, which serves as an example, the high rotary speed of the cylinders, mounted below the former is. transmitted to four inking and to five jockeyrollers, so as to form an entirely complete inking gear comparable with that of the best high speed presses.

Twelve rollers simultaneously serve for spreading the ink which has been conveyed by the jockey rollers and that which is still retained by the inking rollers by being rotated at a high speed from the cylinders mounted below the form; in this manner the inking rollers are completely re-inked. The inking rollers together with the jockey rollers now start on their return journey over the form, the jockey rollers not being lifted off, but resting upon the inking rollers and rotating with them during the second inking of the form, thus serving additionally as distributers during the backward travel, a process of very great importance not only with discontinuous toned plates, having insetdrawings, but also with other difficult printing forms.

The difference in comparison with other known arrangements, is that not only some, but that all of .the inking rollers are provided with jockey rollers, and that each of the former has not only one, but at least two of the latter; by this means a largely am lified storage and a fine distribution of the ink is secured. This augmented storage of ink or rather, ink reservoir, is ca able of providing not only two, but all of t 1e inking rollers with a fresh supply of ink, and, by combination of the many jockey rollers below the form, also an independent and complete inking gear is produced, such as, in its pyramidlike arrangement, is not excelled by the best inking-gear of high speed presses. A further difference consists in this, namely, that the jockey rollers, contrary to previous practice, are used as distributers for the second inking; while they served, in still earlier practice, as distributers both for the first as well as the second inking, they are now used, according to the invention, for the double purose, namely, to serve on the one hand as an 1nk storage, to pass over the form without doing work, and, to replenish all of the inking rollers when below the form, and on the other hand, to act as distributers during the return passage.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed I declare that what I claim is:

1. A duplex inking gear for resses comprising a reciprocating inking ro ler carriage,

inking rollers journaled therein, a jockey roller associating with each of the inking rollers, carrier means for the jockey rollers,

and means whereby on the downward movement of the carriage the inking rollers ink the form and the jockey rollers are moved out of engagement with the inking rollers and on the movement of the carriage in the opposite direction the inking rollers are caused to again ink the form and the jockey rollers are moved into engagement with the inking rollers.

2. A duplex inking gear for presses comprising a reciprocatory inking roller carria e, inking rollers carried thereby, a jockey rol er associating with each of the inking rollers, a shiftable means for maintaining the jockey rollers out of contact with the inking rollers when the carriage moves in one direction, and means for actuatin said shifting means whereby the jockey rollers are brought into contact with the inking rollers when the carriage moves in the opposite direction.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

MAX ROCKSTROH.

Witnesses:

PAUL ARRAs, ULYssEs J. BYWATER. 

